nfs lockd errors after NetApp software upgrade.

[Rick Macklem]

Daniel Braniss wrote:
[stuff snipped]
>all mounts are nfsv3/tcp
This doesn't affect what the NLM code (rpc.lockd) uses. I honestly don't know when
the NLM uses tcp vs udp. I think rpc.statd still uses IP broadcast at times.

To me, it looks like a network configuration issue.
You could capture packets (maybe when a client first starts rpc.statd and rpc.lockd)
and then look at them in wireshark. I'd disable statup of rpc.lockd and rpc.statd
at boot for a test client and then run something like:
# tcpdump -s 0 -s out.pcap host <netapp-host>
- and then start rpc.statd and rpc.lockd
Then I'd look at out.pcap in wireshark (much better at decoding this stuff than
tcpdump). I'd look for things like different reply IP addresses from the Netapp,
which might confuse this tired old NLM protocol Sun devised in the mid-1980s.

>the error is also appearing on freebsd-11.2-stable, I’m now checking if it’s also
>happening on 12.1
>btw, the NetApp version is 9.3P17
Yes. I wasn't the author of the NSM and NLM code (long ago I refused to even
try to implement it, because I knew the protocol was badly broken) and I avoid
fiddling with. As such, it won't have change much since around FreeBSD7.

rick

cheers,
        danny

> rick
>
> Cheers
>
> Richard
> (NetApp admin)
>
> On Wed, 18 Dec 2019 at 15:46, Daniel Braniss <danny at cs.huji.ac.il<mailto:danny at cs.huji.ac.il>> wrote:
>
>
>> On 18 Dec 2019, at 16:55, Rick Macklem <rmacklem at uoguelph.ca<mailto:rmacklem at uoguelph.ca>> wrote:
>>
>> Daniel Braniss wrote:
>>
>>> Hi,
>>> The server with the problems is running FreeBSD 11.1 stable, it was working fine for >several months,
>>> but after a software upgrade of our NetAPP server it’s reporting many lockd errors >and becomes catatonic,
>>> ...
>>> Dec 18 13:11:02 moo-09 kernel: nfs server fr-06:/web/www: lockd not responding
>>> Dec 18 13:11:45 moo-09 last message repeated 7 times
>>> Dec 18 13:12:55 moo-09 last message repeated 8 times
>>> Dec 18 13:13:10 moo-09 kernel: nfs server fr-06:/web/www: lockd is alive again
>>> Dec 18 13:13:10 moo-09 last message repeated 8 times
>>> Dec 18 13:13:29 moo-09 kernel: sonewconn: pcb 0xfffff8004cc051d0: Listen queue >overflow: 194 already in queue awaiting acceptance (1 occurrences)
>>> Dec 18 13:14:29 moo-09 kernel: sonewconn: pcb 0xfffff8004cc051d0: Listen queue >overflow: 193 already in queue awaiting acceptance (3957 occurrences)
>>> Dec 18 13:15:29 moo-09 kernel: sonewconn: pcb 0xfffff8004cc051d0: Listen queue >overflow: 193 already in queue awaiting acceptance …
>> Seems like their software upgrade didn't improve handling of NLM RPCs?
>> Appears to be handling RPCs slowly and/or intermittently. Note that no one
>> tests it with IPv6, so at least make sure you are still using IPv4 for the mounts and
>> try and make sure IP broadcast works between client and Netapp. I think the NLM
>> and NSM (rpc.statd) still use IP broadcast sometimes.
>>
> we are ipv4 - we have our own class c :-)
>> Maybe the network guys can suggest more w.r.t. why, but as I've stated before,
>> the NLM is a fundamentally broken protocol which was never published by Sun,
>> so I suggest you avoid using it if at all possible.
> well, at the moment the ball is on NetAPP court, and switching to NFSv4 at the moment is out of the question, it’s
> a production server used by several thousand students.
>
>>
>> - If the locks don't need to be seen by other clients, you can just use the "nolockd"
>>  mount option.
>> or
>> - If locks need to be seen by other clients, try NFSv4 mounts. Netapp filers
>>  should support NFSv4.1, which is a much better protocol that NFSv4.0.
>>
>> Good luck with it, rick
> thanks
>        danny
>
>> …
>> any ideas?
>>
>> thanks,
>>       danny
>>
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